Year	Number
2004-01-01	9.9728
2005-01-01	14.7956
2006-01-01	19.5543
2007-01-01	37.1202
2008-01-01	52.2917
2009-01-01	56.8486
2010-01-01	61.3398
2011-01-01	64.7966
2012-01-01	68.6044
2013-01-01	70.6393
2014-01-01	72.1055
2015-01-01	71.1944
2016-01-01	74.0006
2017-01-01	75.0609